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WILLIAM C. SMITIL'OF WARRENSBURG, MISSOURI.

Letters Patent No. 77,668, amenit 5, 1868.

IMPROVED SUGAR-'EVAPORATOR.

TO ALL WHOM .IT"MAY CONCERN: I

Be it known that], WILLIAM 0. SMITH, of Warrensburg, in the county ofJohnson, and State of Missouri, have made certain new and usefulImprovements in ,Sngar-Evaporators; and I do hereby declare that thefollowing is a full and clear description thereof, reference being hadto the accompanying drawings, and to the letters of reference markedthereon. V

This invention relates to 'a'certain arrangement of thc firc-box,air-ducts, flues, and dampers, whereby the heat generated within thesaid furnace is held more absolutely under the control of theoperator,and rendered perfectly adapted to the purposeof reducingsaccharine sirnps when placed within the superimposed evaporatingpans.hIoreparticularly, this is an improvement in an evaporating-apparatussecured to the inventor of this improvement, by Patent No. 65,702, datedJune'll, 1867.

To enable those skilled in the art tomake and use my improved apparatus,I will proceed" to describe its construction and operation. Of theaccompanying drawings Figure 1, sheet 1, is an elevation in perspectiveof the improved apparatus. I Figure 2, sheet 1, is a central sectionalelevation of the same.

Figure 3, sheet 1, is a transverse sectional elcvation, taken throughthe fire-box and s'moke staek. .Figure 4, sheet 2, is a sectional plan,taken on the line a: y in fig. 2. V Figure 5, sheet 2, is a sectionalplan, taken on the line :c' y in fig. 2.

A represents the shell of the device, and may be constructed in aportable manner by mounting it on wheels, or it may be made stationaryand enclosed in a setting of masonry. The general contour of this -shellA is very similar to that of the corresponding device in Patent No.65,702, and, like it, the presentdevicc has three pan-seats, a a aarrangedli'lie a flight of steps. On thc .upper one of these stepsia,the primary pan is placed; on the sccondand next lower-one, a, islocated the evaporating-pan and on the lowest, is placed thefinishing-pan. The pans themselves are not illustrated in theaecompanyingdrawings, as theyform no part of the invention, the sole endand aim of which are to so arrangeand control the heat as to render'itentirely-sub scrvient to the purpose of reducing the sirup .placedwithin the aforesaid pans. The fire-box 13 maybe construeted ofcast-iron plates, and provided with a grate, b, for the support of thefuel. For'convenieucc sake, thedoo'r 6 through which the furnace is tobe fed with fnel,.should be located at the back end of the apparatus. Bymeans-of the walls A, thebaek end of the shell' or case A is dividedinto three compartments, 13 B 13, the central one of which, B, is thefire-box. The air which feeds the fire is to he admitted, throughthe'door 6, into the chamber 13 and thence it"finds its way aroundthrough sinuous-passages, inthe direction of the arrows 6 into thechamber 13 where it escapes through the'aperture 6 into the fire-boxbelow the. grate-bars. There are retainingwalls Zr" in the chambers 1313 for the purpose of retarding the passage of the air through themuntil it is thoroughly heated, and heating the air supplied to thefurnace is the object of this arrangement of the said chambers andpnssag'es.- In case the draught thus provided should not provesufiicient in starting the fire, the small door, h may he opened in thefront, or the door I) leading to the ash-pit B'fi Direetly'over thefurnace there is adamper or slide, D, which may be opened, so as topermit a direct communication from thefnrnace to the chimney O. Thedamper or slide D is placed in the horizontal partition-wall d, whichforms the top of the fire-hon, and another slide,.D, is placed-in thesame partition, forward of'the slide 1), as is shown in figs. 2 and 4.The wall d extends the entire length of the machine, parallel with thepan-seatsa' a a, and between the said pansealsand the aforesaid wall cl,the hot-air and smoke-fines are arranged by means-of the said walls, andthe vertical partitions E E, and the dampers c e and e e, the same as inmy former patent. In

I front of the damper or slide ID is another, D operated by the rod d.As has been already described, the

opening of the damperD admitsthe currcnt'of smoke and hot gases directlyto the chimney C. Inlike manner the opening of the damper D admits saidheated current to the bottom of the first pan, and the opening of thedamper D admits the heat to the bottomot' the second pan. The dampers ce are used for the same purpose and in the same manner in which theywere in my former patent.

nets 2 Having described my invention, what I claim, is- 1. Theair-heating chambers B Biwhen combined with the fire-box B, in themanner and for the purpose herein set forth and described.

2. I claim the dampers or slides D D D when arranged and operated as apdfor the purpose shown and descrihed.

WM. 0. SMITH.

Witnesses M. mzwonpn, H. PAULI.

